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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Oct. 31, 2014
Percentage owned affiliates accounted for under equity method, minimum 20.00%bwa_PercentageOwnedAffiliatesAccountedForUnderEquityMethodMinimum    
Percentage owned affiliates accounted for under equity method, maximum 50.00%bwa_PercentageOwnedAffiliatesAccountedForUnderEquityMethodMaximum    
Inventory Disclosure [Abstract]      
Inventories, net $ 505.7us-gaap_InventoryNet $ 458.1us-gaap_InventoryNet  
Inventory, LIFO Reserve 18.3us-gaap_InventoryLIFOReserve 16.0us-gaap_InventoryLIFOReserve  
United States      
Inventory Disclosure [Abstract]      
Inventories, net 108.7us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= country_US
109.3us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= country_US
 
Minimum [Member]      
Standard Product Warranty Disclosure [Abstract]      
Standard Product Warranty Description P1Y    
Minimum [Member] | Long-term Supply Arrangements [Member]      
Property, Plant and Equipment [Abstract]      
Property, Plant and Equipment, Useful Life, Minimum 3 years    
Minimum [Member] | Building [Member]      
Property, Plant and Equipment [Abstract]      
Property, Plant and Equipment, Useful Life, Minimum 15 years    
Minimum [Member] | Machinery and equipments      
Property, Plant and Equipment [Abstract]      
Property, Plant and Equipment, Useful Life, Minimum 3 years    
Maximum [Member]      
Standard Product Warranty Disclosure [Abstract]      
Standard Product Warranty Description P3Y    
Maximum [Member] | Long-term Supply Arrangements [Member]      
Property, Plant and Equipment [Abstract]      
Property, Plant and Equipment, Useful Life, Minimum 5 years    
Maximum [Member] | Building [Member]      
Property, Plant and Equipment [Abstract]      
Property, Plant and Equipment, Useful Life, Minimum 40 years    
Maximum [Member] | Machinery and equipments      
Property, Plant and Equipment [Abstract]      
Property, Plant and Equipment, Useful Life, Minimum 12 years    
Receivables Securitization [Member]      
Inventory Disclosure [Abstract]      
Total short-term debt   $ 110.0us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= bwa_ReceivablesSecuritizationMember
$ 110.0us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= bwa_ReceivablesSecuritizationMember